/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: http://www.qt-project.org/
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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**************************************************************************/

#include "callgrindstackbrowser.h"

namespace Valgrind {
namespace Callgrind {

StackBrowser::StackBrowser(QObject *parent)
    : QObject(parent)
{
}

void StackBrowser::clear()
{
    m_stack.clear();
    m_redoStack.clear();
    emit currentChanged();
}

void StackBrowser::select(const Function *item)
{
    if (!m_stack.isEmpty() && m_stack.top() == item)
        return;

    m_stack.push(item);
    m_redoStack.clear();
    emit currentChanged();
}

const Function *StackBrowser::current() const
{
    return m_stack.isEmpty() ? 0 : m_stack.top();
}

void StackBrowser::goBack()
{
    if (m_stack.isEmpty())
        return;

    m_redoStack.push(m_stack.pop());
    emit currentChanged();
}

void StackBrowser::goNext()
{
    if (m_redoStack.isEmpty())
        return;

    m_stack.push(m_redoStack.pop());
    emit currentChanged();
}

} // namespace Callgrind
} // namespace Valgrind